Endress+Hauser Deltabar S FMD77 - Explanation of Terms

Deltabar S
Endress+Hauser 9
Explanation of terms
Explanation of the terms "turn down (TD)",
"set span" and "zero-based span"
Case 1:
• ~Lower range value (LRV)~ d~Upper range value
(URV)~
Example:
• Lower range value (LRV) = 0 mbar
• Upper range value (URV) = 100 mbar (1.5 psi)
• Nominal value (URL) = 500 mbar (7.5 psi)
Turn down:
•TD = URL /~URV~ 5:1
Set span:
• URV – LRV = 100 mbar (1.5 psi)
This span is based on the zero point.
P01-xxxxxxxx-05-xx-xx-xx-001
Example: 500 mbar (7.5 psi) measuring cell
Case 2:
• ~Lower range value (LRV)~ t~Upper range value
(URV)~
Example:
• Lower range value (LRV) = –300 mbar (4.5 psi)
• Upper range value (URV) = 0 bar
• Nominal value (URL) = 500 mbar (7.5 psi)
Turn down:
•TD = URL / ~(LRV)~ = 1.67:1
Set span:
• URV – LRV = 300 mbar (4.5 psi)
This span is based on the zero point.
P01-xMD7xxxx-05-xx-xx-xx-007
Example: 500 mbar (7.5 psi) measuring cell
1 Set span
2 Zero-based span
3 Nominal value i upper range limit (URL)
4 Nominal measuring range
5 Sensor measuring range
LRL Lower range limit
URL Upper range limit
LRV Lower range value
URV Upper range value
–500 mbar
0
+500 mbar
100
LRL
LRV
URL
URV
➁➀
=
➂
➃
➄
–500 mbar
+500 mbar
LRV
URLURV
➂
0
LRL
–300 mbar
➁➀
=
➃
➄